完全按照視頻在AS下寫的，但一運(yùn)行就報(bào)錯(cuò)，提示java.lang.RuntimeException: An error occured while executing doInBackground()，關(guān)鍵就是is = connection.getInputStream()這句不知有什么問(wèn)題。

protected Bitmap doInBackground(String... strings) {
? ?//獲取傳遞進(jìn)來(lái)的參數(shù)
? ?String url = strings[0]; //取出對(duì)應(yīng)url
? ?Bitmap bitmap = null;
? ?URLConnection connection; //定義網(wǎng)絡(luò)連接對(duì)象
? ?InputStream is; //用于獲取數(shù)據(jù)的輸入流
? ?try {
? ? ? ?connection = new URL(url).openConnection(); //獲取網(wǎng)絡(luò)連接對(duì)象
? ? ? ?is = connection.getInputStream();
? ? ? ?BufferedInputStream bis = new BufferedInputStream(is);
? ? ? ?bitmap = BitmapFactory.decodeStream(bis); //將輸入流解析成bitmap
? ? ? ?is.close();
? ? ? ?bis.close();
? ?} catch (IOException e) {
? ? ? ?e.printStackTrace();
? ?}
? ?return bitmap;
}